I am found Wally randomly on Youtube and I just had to try to make one! I already have a Makerbot Replicator 2x and a Thing-o-Matic, but would like to get into RepRap printers. I have already printed about 80% of Wally, but I cannot find the Filament Drive Block STL that is supposed to be in Group B is there something I'm missing?

Nicholas, I guess I don't understand where the problem is. Is it a mechanical accuracy issue that requires software profiling of each individual mechanics set to compensate, or is it a kinematics problem that just has not been programmed correctly yet?

How would the Wally variation that we discussed privately a while back that drives one shoulder and elbow, like a single arm SCARA, and has a linear Z axis change the issue?

There is something wrong with the XY independent of the Z. I think it might be a math problem. I would spend more time working on it but there are other design deficiencies that make me want to take what I have learned and move one. I have a 1-arm SCARA that should replace Wally. I am going to make an exploratory machine soon to figure out how some new concepts will play out.

Okay well I have everything printed for Wally, but if it is something that I will ultimately end up frustrated with would you suggest to set Wally aside until some improvements have been made? Also would you suggest building Gus Simpson or Lisa Simpson because I really want to build a reprap and I really like these designs.

It all depends on what you want from the printer. None of them will be good daily workhorse printers. They would be good if you want to play with alternative designs. For now, they could be better viewed as starting points instead of end points.

LISA was built as a joke. She is the best, most accurate one of the bunch but I would suggest a Kossel over her.

GUS will eventually get new arms but I am not sure what the timeline is on that.

Wally will be replaced with a 1-Arm SCARA.

They are all fun to watch but none of them are firefly practical... Yet.